Noissue - Eliminate compile warnings in the plugin

src/plugin/NotificationMessage.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 10 matching lines @@
 #include <string>
 
 class NotificationMessage
 {
 public:
   NotificationMessage(HWND parent = 0);
   ~NotificationMessage(){};
   bool Show(std::wstring message, std::wstring title, int icon);
   void Hide();
   void Move(short x, short y);
+  void MoveToCenter(const RECT& r)
+  {
+    Move(static_cast<short>((r.left + r.right) / 2), static_cast<short>((r.top + r.bottom) / 2));
+  }
   bool SetTextAndIcon(std::wstring text, std::wstring title, int icon);
   void SetParent(HWND parent);
   bool IsVisible();
 private:
   HWND parentWindow;
   HWND toolTipWindow;
   static bool commonControlsInitialized;
   static void InitializeCommonControls();
 };
 
 #endif